Researcher Database

KURUMISAWA Kiyofumi
Faculty of Engineering Sustainable Resources Engineering Resources Engineering
Associate Professor

Researcher Profile and Settings

Affiliation

  • Faculty of Engineering Sustainable Resources Engineering Resources Engineering

Job Title

    Associate Professor

URL

Research Interests

  • NMR   cement   concrete   microstructure   durability   

Research Areas

  • Architecture and building engineering / Building structures/Materials
  • Architecture and building engineering / Building structures/materials

Academic & Professional Experience

  • 2005    - Researcher

Education

  •        - 2003  Tokyo Institute of Technology  Graduate School, Division of Integrated Science and Engineering

Association Memberships

  • JAPAN CONCRETE INSTITUTE   

Research Activities

Published Papers

  • Ali Jamshidi, Greg White, Mehdi Hosseinpour, Kiyofumi Kurumisawa, Meor Othman Hamzah
    Construction and Building Materials 217 487 - 497 09500618 2019/08 [Refereed][Not invited]
     
    © 2019 Elsevier Ltd The effects of the reclaimed asphalt pavement (RAP) source and content on the dynamic modulus (E * ) of hot mix asphalt concrete were characterized. Two parameters were proposed: the non-dimensional dynamic modulus-temperature index (∇E T* ) and non-dimensional dynamic modulus-frequency index (∇E fr* ). Parameter ∇E fr* indicates the increase of relative E * per unit percent RAP from different sources during frequency and temperature sweeps, while ∇E T* characterizes the reduction of relative E * per 1 °C temperature increase. An analysis of the results showed that ∇E T* of RAP mixes were 6.80% to 12% higher than those of the control samples, indicating less temperature susceptibility. Furthermore, an analysis of ∇E fr* trends showed temperature independency at higher temperature ranges. In addition, the results showed that the activation energy (AE) of the mixes was 1.51 MJ/mol/K to 9.86 MJ/mol/K higher than that of the control samples (without RAP), which depends on the RAP content and source. Moreover, E * linearly increases as AE increases. In conclusion, the increase of intermolecular forces owing to the higher AE in the blended binders increased the mix stiffness, which resulted in a higher E * in mixes containing RAP.
  • Kenta Sasaki, Kiyofumi Kurumisawa, Kouhei Ibayashi
    Construction and Building Materials 216 337 - 346 09500618 2019/08 [Refereed][Not invited]
     
    © 2019 Elsevier Ltd Geopolymer concrete presents a major problem regarding its practical application, in that the geopolymer paste has very short setting time. Previous studies have shown that the addition of blast furnace slag to geopolymer paste considerably shortens the setting time. Based on these findings, in the present study, setting retarders were used to lengthen the setting time of the geopolymer paste. The objective of the present study was to identify the effect of a setting retarder on the fluidity and compressive strength of alkali-activated fly ash/blast furnace slag-based materials. It was shown that, by adding a chelator as a retarder, the setting time can be prolonged. However, the setting time was found to be dependent on the type of chelator. Similarly, the compressive strength development of the geopolymer was also found to be dependent on the type of chelator. It was clarified that the concentration of calcium and aluminum in solution during hardening changes with the addition of a chelator, and it was shown that there is a correlation between the concentrations of calcium and aluminum and the setting time.
  • Ali Jamshidi, Kiyofumi Kurumisawa, Gregory White, Tatsuo Nishizawa, Toshifumi Igarashi, Toyoharu Nawa, Jize Mao
    Construction and Building Materials 200 713 - 755 09500618 2019/03 [Refereed][Not invited]
     
    © 2018 Elsevier Ltd Researchers dealing with pavements and experts on materials have been increasingly focused on the structural strength of the pavement materials without paying sufficient attention to the environment and cultural norms. In the 21st century, the concept of pavement design and rehabilitation needs to be modified owing to new requirements such as the additional structural loads derived from the climate change, environmental challenges, social requirements, and aging population. Therefore, the concept of post-modern pavement (PMP) was proposed to address the structural, sustainability, and socio-psychological requirements. In this review of the state-of-the-art, the potential of the interlocking concrete block pavement (ICBP) was evaluated based on its laboratory and field structural performance, sustainability, and social acceptance as a PMP in Japan. Therefore, the relevant literature in English and Japanese, including journals, conference proceedings, technical reports, books, and theses, over a span of 47 years (1971–2018), were studied. It was found that the structural and functional performances of the ICBP in different facilities were satisfying. Furthermore, owing to its waste material use, less noise emission, air purifying characteristics, and heat island reduction, the environmental performance of ICBP was in harmony with sustainable practices. In addition, pavements users, both able and differently abled, rated the ICBP as a more appropriate pavement system owing to its physical appearance, serviceability, aesthetic features, lower heat island effect, rapid maintenance, and positive psychologic effects after earthquake and tsunami events. As a result, the ICBP can be recommended as a PMP for the design and development of resilient transportation infrastructure assets in Japan.
  • OJIMA Mami, SASAKI Kenta, KURUMISAWA Kiyofumi
    Cement Science and Concrete Technology セメント・コンクリート論文集 72 (1) 114 - 121 0916-3182 2019 [Refereed][Not invited]
     

    The use of blast furnace slag cement for concrete production with air entrained agent(AE)for improving freeze-thaw resistance in cold climates such as Hokkaido region cause the decrease of the initial strength of concrete. In order to improve initial strength of concrete, a novel curing accelerator using a combination of a polyol type and a sulfate type has been developed, and a high hydration acceleration effect is obtained by previous reports. However, its hydration acceleration mechanism has not been clarified in detail. In this study, attempts were made to elucidate the mechanism of initial strength development of blast furnace slag cement by adding a new curing accelerator. Firstly, we confirmed the strength development and ultrasonic pulse velocity of hardened cement pastes with/without the hydration accelerator. And we investigated the phase assemblage in hardened cement pastes by XRD Rietveld method, and the degree of reaction of blast furnace slag in hardened blast furnace slag cement pastes was determined by backscattered electron image. As a result, it is possible to accelerate the hydration reaction of the aluminate phase by combining the polyol type and the sulfate type of agent, there is a possibility that the curing accelerator dissolves the portlandite to accelerate the reaction of the blast furnace slag fine powder.

  • KURUMISAWA Kiyofumi
    Cement Science and Concrete Technology セメント・コンクリート論文集 72 (1) 173 - 180 0916-3182 2019 [Refereed][Not invited]
     

    Mercury intrusion porosimetry has been widely used as a method to measure the pore structure of cementitious materials, but considering the influence on the environment, a method that does not use mercury is required. Also, in the mercury intrusion porosimetry, the sample is dried before measurement, so the measurement result indicates the pore structure of the dried sample. Therefore, a thermoporometry method can be proposed as a method not requiring the use of mercury and drying process of specimen. The thermoporometry method estimates the porosity from the amount of heat generated during the freezing and thawing of water in the pore. So far, the authors have measured with a small size of sample, but in this study the thermoporometry method was applied to the bulk sample. As a result, peaks which could not be measured with a small size of sample could be detected. And it was clarified that blending blast furnace slag forms finer pore structure of hardened cement paste. Therefore, transport properties of hardened cement paste with BFS was improved. It was also clarified that the diffusion of chloride ions in hardened cement paste depends on the pore volume of 6nm or more.

  • Ali Jamshidi, Gregory White, Kiyofumi Kurumisawa, Toyoharu Nawa, Toshifumi Igarashi, Meor Othman Hamzah
    Journal of Cleaner Production 189 635 - 646 09596526 2018/07 [Refereed][Not invited]
     
    © 2018 Elsevier Ltd In this study, the effects of the warm-mix asphalt additive content, asphalt type, and various mixing and test temperatures on the creep stiffness and cumulative micro-strain of asphalt mixtures were analyzed. In addition, the correlation between the rheological properties of the warm mix binders and mixtures were evaluated. Furthermore, a new methodology, namely, the hypotenuse length and sustainable angle method, was proposed to analyze the structural–environmental performance of the warm mix technology. The results showed that there was a close relationship between the properties of the asphalt binders and mixtures for various binder types and ageing states. Furthermore, the results indicated that this new methodology could be used by pavement and environment engineers to determine whether an asphalt mix is consistent with environmental regulations well as satisfying the structural performance requirements.
  • Elakneswaran Yogarajah, Toyoharu Nawa, Kiyofumi Kurumisawa
    Journal of Materials in Civil Engineering 30 (5) 08991561 2018/05 [Refereed][Not invited]
     
    © 2018 American Society of Civil Engineers. In this study, the surface electrical properties of calcium silicate hydrate (C-S-H) and their influence on ionic adsorption have been investigated to be able to predict chloride binding in slag-containing cementitious materials. The experimental data showed that the electrokinetic potential of slag cement paste (SCP) is intermediate between hydrated cement paste (HCP) and C-S-H with Ca/Si of 1.0 (C-S-H:1.0) or slag calcium hydroxide paste (SCHP). Two types of C-S-H available in the hydrated SCP for ionic adsorption are considered: one is similar to the C-S-H of HCP and other is like C-S-H:1.0. The surface complexation modeling parameters for ionic adsorption on C-S-H:1.0 were estimated by fitting the experimental data to simulation results. The estimated parameters for C-S-H:1.0 together with surface complexation modeling parameters for HCP were used to predict the adsorption of chloride on SCP. The simulation results show good agreement with experimental data and follow a Freundlich isotherm. When portland cement is partially replaced by slag, it modifies the surface electrical properties of C-S-H in addition to mineralogy and pore structure and leads to change in the chloride adsorption behavior.
  • Ben Li, Lalita Baingam, Kiyofumi Kurumisawa, Toyoharu Nawa, Liu XiaoZhou
    Construction and Building Materials 164 554 - 569 09500618 2018/03 [Refereed][Not invited]
     
    © 2018 Elsevier Ltd The alkali-silica reaction causes long-term degradation of microstructure of cement paste and aggregate, and as results in macroscopic expansion. In this paper, a micro-mechanical expansion model was developed coupling with the damage and thermodynamic theory. First of mortar thermal coefficients were estimating to determine the true expansion due to ASR based on EPMA and MIP results and expansion proposed in this paper were compared with analysis results of Suwito's and Multon's model. The results indicate that the increasing of temperature conducted reduced fluctuations of ASR expansion coefficient of cement paste. In addition, our proposed model accurately reproduces the true-dependency of expansion due to ASR with the lowest error. Overall, the proposed microscopic expansion model is able to apply for numerical analyse of deteriorated due to ASR concrete structure designs with in the deterioration of ASR in the future.
  • Dejeto Rodrigo V., Kurumisawa Kiyofumi
    INTERNATIONAL JOURNAL OF ADVANCED AND APPLIED SCIENCES 5 (5) 110 - 115 2313-626X 2018/05 [Refereed][Not invited]
  • Ali Jamshidi, Kiyofumi Kurumisawa, Toyoharu Nawa, Bijan Samali, Toshifumi Igarashi
    Journal of Cleaner Production 166 1507 - 1520 09596526 2017/11 [Refereed][Not invited]
     
    © 2017 Elsevier Ltd This study evaluates the effects of high percentages of different by-products, including blast furnace slag (BFS) and fly ash (FA), on the structural performance, energy requirement and environment impacts of a concrete heavy-duty pavement (HDP) at various curing temperatures. The results of the structural performance indicate that HDP containing up to 70% BFS and HDP containing 30% FA can be comparable in controlling the HDPs designed for highways and airports. Moreover, the results of the environmental impact assessment indicate that the synergy of the by-product and warm water can reduce the energy requirement and CO 2 footprint by 5.77%–56.54% and 8.16%–55.5% for the highway and airport HDPs, respectively. Although the elevated curing temperature improves the structural performance and sustainability of the concrete pavements, any delay in concrete production increases energy consumption accordingly. Moreover, a new parameter (∇ TE ), which is the time gradient per unit energy consumption developed based on the Laplace transformation, is proposed to characterize the effect of the time delay in concrete production. This parameter indicates that the time required for a unit energy consumption (1 TJ) decreases by 50%, as the curing temperature increases. In conclusion, analysis of the structural design, carbon footprint, and the results of ∇ TE indicate that 35 °C can be proposed as the optimum water curing temperature for the HDP incorporating by-products.
  • Ali Jamshidi, Kiyofumi Kurumisawa, Toyoharu Nawa, Mao Jize, Gregory White
    Journal of Cleaner Production 164 367 - 388 09596526 2017/10 [Refereed][Not invited]
     
    © 2017 Elsevier Ltd Pavements are one of the most energy-intensive infrastructure assets that depend on non-renewable natural resources. Against the background of restrictions on landfill disposal, the increased use of alternative materials such as industrial byproducts in pavement construction has gained great attention from academic and industrial sectors. However, comprehensive research covering various aspects of pavements incorporating different byproducts is lacking. The main purpose of this state-of-the-art study is to bridge this gap via the analysis of the performance of pavements incorporating two types of byproducts, blast furnace slag, and fly ash, from the perspectives of structural performance, energy saving potential, and greenhouse gas emission reduction at various phases of pavement life. Therefore, the contents of 150 published documents, including research papers, theses, and academic and industrial reports published over a span of 49 years (1968–2017) were analyzed. The major findings indicated that incorporation of the byproducts may have positive or negative consequences in various phases of pavement life. However, the new pavements are advantageous from the viewpoint of raw material processing because of low consumption of raw materials and pertinent environmental footprints. In addition, several scenarios are proposed for ranking the alternative materials on the basis of the technical and environmental requirements for a paving project; these scenarios can be useful for the preliminary selection of alternative materials. Finally, some gaps are highlighted for future research.
  • Ali Jamshidi, Kiyofumi Kurumisawa, Toyoharu Nawa, Jize Mao, Ben Li
    Journal of Traffic and Transportation Engineering (English Edition) 4 (2) 118 - 130 20957564 2017/01 [Refereed][Not invited]
     
    © 2017 The Authors.In this study, the effects of the thermal properties of asphalt binders and aggregate materials were characterized in terms of the specific heat capacity (C) for energy consumption and environmental footprints of hot mix asphalt (HMA) and warm mix asphalt (WMA). Asphalt mixes produced using low-C aggregate are found to be more energy-efficient and environmental friendly, irrespective of the binder type and construction technology. Therefore, different fractions of aggregate blends were replaced with the aggregate provided from a low-C source or sustainable source. Analysis of energy consumption clearly indicated that the specific energy and environmental footprints decrease linearly as the low-C aggregate content increases. The amount of energy saving realized in the asphalt industries by the use of low-C aggregate is significant on a national scale in China. In this regard, China was chosen as a case study. Analysis of fuel requirement clearly indicated that the production of WMA using high thermal sensitivity aggregate can yield significant energy saving sufficient to fuel 44,007 to 664,880 Chinese households per year. Therefore, use of low C aggregate in asphalt mix production can be adopted as a strategy to produce WMA and HMA.
  • Hatanaka Akira, Elakneswaran Yogarajah, Kurumisawa Kiyofumi, Nawa Toyoharu
    Journal of Advanced Concrete Technology Journal of Advanced Concrete Technology 15 (8) 426 - 439 1346-8014 2017/08 [Refereed][Not invited]
     

    The purpose of this study is to determine the tortuosity of cementitious materials containing blast furnace slag (BFS). Furthermore, the influence of tortuosity on multi-species transport into these materials is studied. The porosity and diffusivity of calcium silicate hydrate (C-S-H) were predicted using a three-dimensional spatial distribution model, which were then fitted to Archie's law to determine tortuosity. The tortuosity increased with the slag replacement ratio, suggesting that the diffusion path for ions becomes complicated and lengthy due to slag addition. Thermoporometry was used to determine the pore size distribution of hydrated slag-blended cement. A partial replacement of ordinary Portland cement (OPC) with BFS modified the mineralogy (especially in the types of C-S-H), resulting in changes to the pore structure. The determined tortuosity and porosity were used in a reactive transport model to predict multi-species transport. Experimentally measured and simulated chloride profiles were in good agreement for hydrated OPC and slag-blended cements exposed to sodium chloride solutions. The causes for the low penetration rate of chloride in slag-blended cementitious materials are discussed considering their pore structure and surface electrical properties. The role of tortuosity on Cl-/OH- for the evaluation of chloride induced corrosion was also discussed.

  • SUGIYAMA Takuya, MIYAMOTO Masanori, KURUMISAWA Kiyofumi, HATANAKA Akira
    Cement Science and Concrete Technology セメント・コンクリート論文集 71 (1) 177 - 184 0916-3182 2017 [Refereed][Not invited]
     

    The importance of maintenance and repair of existing concrete buildings has increased. Therefore, it is necessary to know the exact deterioration condition of a concrete building structure, so it is required to accurately measure the pore structure. As one of the measurement techniques, thermoporometry has been proposed. Thermoporometry does not need drying and applying high pressure to specimen during measurement, so there is little risk of damage to the cement paste. In this study, we measured some physical property(uniaxial compressive strength, ultrasonic velocity, electric conductivity, and chloride ion diffusion)and pore structure of OPC paste and fly ash cement paste. And we investigated the relationship between the physical properties and the pore structure measured by using thermoporometry and mercury intrusion porosimetry. As a result, the uniaxial compressive strength and the ultrasonic velocity can be estimated by using pore volume measured by thermoporometry and mercury intrusion porosimetry. Transport properties such as the electric conductivity and chloride ion diffusion could be estimated by separating each OPC paste and fly ash cement paste. And it was suggested that the diffusivity could be estimated by using the quantity of pore volume detected in the freezing process around -15℃ which is the connected capillary pore volume.

  • Ali Jamshidi, Kiyofumi Kurumisawa, Toyoharu Nawa, Toshifumi Igarashi
    Renewable and Sustainable Energy Reviews 64 211 - 236 13640321 2016/10 [Not refereed][Not invited]
     
    © 2016 Elsevier Ltd.This paper discusses the engineering properties of waste glass (WG), including its structural and environmental performance, as an alternative material for the construction of various types of paving systems, including asphalt, concrete, and block pavements. As a first step, an overview of the asphalt, cement, and glass manufacturing industries is provided. Then, a large volume of data is analyzed from various sources in the literature. Particular emphasis is given to laboratory studies of the structural performance and durability of WG. Additionally, the effect of WG on the field performance of the pavements is discussed. The sustainability of the pavements is also evaluated in terms of energy consumption, greenhouse gas emissions, safety, and the heat island phenomenon. In conclusion, the use of WG can improve various phases of pavement life and structure by enhancing the structural performance, durability, environmental friendliness, and aesthetic features of pavements.
  • Kiyofumi Kurumisawa, Kazuko Haga, Daisuke Hayashi, Hitoshi Owada
    Physics and Chemistry of the Earth 99 175 - 183 14747065 2016/08 [Refereed][Not invited]
     
    © 2017 Elsevier Ltd.It is very important to predict alterations in the concrete used for fabricating disposal containers for radioactive waste. Therefore, it is necessary to understand the alteration of cementitious materials caused by calcium leaching when they are in contact with ground water in the long term. To evaluate the long-term transport characteristics of cementitious materials, the microstructural behavior of these materials should be considered. However, many predictive models of transport characteristics focus on the pore structure, while only few such models consider both, the spatial distribution of calcium silicate hydrate (C-S-H), portlandite, and the pore spaces. This study focused on the spatial distribution of these cement phases. The auto-correlation function of each phase of cementitious materials was calculated from two-dimensional backscattered electron imaging, and the three-dimensional spatial image of the cementitious material was produced using these auto-correlation functions. An attempt was made to estimate the diffusion coefficient of chloride from the three-dimensional spatial image. The estimated diffusion coefficient of the altered sample from the three-dimensional spatial image was found to be comparable to the measured value. This demonstrated that it is possible to predict the diffusion coefficient of the altered cement paste by using the proposed model.
  • Ali Jamshidi, Meor Othman Hamzah, Kiyofumi Kurumisawa, Toyoharu Nawa, Bijan Samali
    Materials and Design 95 9 - 20 02641275 2016/04 [Refereed][Not invited]
     
    © 2016 Elsevier Ltd.There are many technologies to produce sustainable asphalt pavements that may affect various phases of pavement life. Therefore, it is difficult to choose the most appropriate technology that addresses all the engineering requirements, especially in the technologies produce the identical outputs. In this study, a PG64 asphalt binder (base binder) was upgraded to PG70 (target binder) through incorporation of two different sustainable approaches: (1) synthetic wax and (2) recovered binder from reclaimed asphalt pavement (RAP). The effects of the different modification methods were evaluated in terms of the engineering properties of materials and the sustainability features of mix production. The results indicated the modified binder (as outputs) have the same performance grade as the target binder, but the incorporation of RAP reduces the environmental pollutants at the stage of raw material processing, while the use of the wax decreases the pollutants during asphalt mix production. Consequently, the selection of the type of sustainable technology for production of cleaner asphalt pavement depends significantly on the stage desired to be modified in the pavement construction. A few scenarios and a new method are also proposed as a guide to selection of the appropriate sustainable approaches based on the binder and engineering properties.
  • Kurumisawa Kiyofumi, Nawa Toyoharu
    Journal of Advanced Concrete Technology Journal of Advanced Concrete Technology 14 (3) 87 - 94 1346-8014 2016/03 [Refereed][Not invited]
     
    The transport properties of hardened cement paste (HCP) have been investigated in many studies; the AC impedance method (ACI) is a non-destructive technique employed for this purpose and has been used in investigations of the elec-trical characteristic and mass transport properties of HCP. However, there are relatively fewer studies investigating chloride ingress in HCP and using the ACI. In this study, the relationship between the electrical conductivity measured by the ACI and chloride ingress was investigated. Backscattered electron image analysis and mercury intrusion porosimetry and water porosity were used to measure the pore structure of HCP, and the chloride ingress depth was measured by an electron probe microanalyzer. There was a high correlation between the porosity and conductivity and between the conductivity and diffusion coefficient of the chloride ions in HCP. This implies that the diffusion coefficient of chloride ions could be estimated by the conductivity measurements.
  • MIYAMOTO Masanori, SUGIYAMA Takuya, KURUMISAWA Kiyofumi, NAWA Toyoharu
    Cement Science and Concrete Technology セメント・コンクリート論文集 70 (1) 134 - 140 0916-3182 2016 [Refereed][Not invited]
     

    The purpose of this research is to understand the mass transfer characteristics of concrete to predict the durability of the concrete. There is a close relationship between transport properties of several ions and adsorption ability. It was reported that the adsorption ability of the concrete is changed with the calcium leaching of concrete caused by contact with such as groundwater in a long-term. It was also reported that the adsorption ability of the Calcium-silicate-hydrate(C-S-H)is dependent on its CaO/SiO2(Ca/Si)ratio, but the sample in their research is only White Portland Cement(WPC)and Blast Furnace Slag(BFS)cement. On the other hand, it is reported that FA cement has a high resistance to calcium leaching. In this study, leaching experiments using ammonium nitrate solution and chloride ion adsorption experiment were carried out for FA specimens. It was shown that Ca/Si ratio of C-S-H in each sample is decreased with and Al2O3/SiO2(Al/Si)ratio of C-S-H is increased with calcium leaching. The amount of chloride ion adsorption is linearly decreased with its Ca/Si ratio and Al/Si ratio. Finally, we established the equation for predicting the amount of chloride adsorption in C-S-H with different Ca/Si ratio and Al/Si ratio.

  • KURUMISAWA Kiyofumi, NAWA Toyoharu
    Cement Science and Concrete Technology セメント・コンクリート論文集 70 (1) 230 - 235 0916-3182 2016 [Refereed][Not invited]
     

    It is necessary to evaluate transport properties of concrete for lengthening the durability of concrete, therefore it is very important to measure the pore structure of hardened cement paste precisely in understanding mass transport properties. The electric conductivity by the AC impedance method have been suggested as simple and accurate technique to understand it, and the usefulness is reported in the case of hardened cement paste used with ordinary Portland cement. However, this technique has not been applied for hardened cement paste mixed with fly ash that has very high resistance to chloride ingress. In this study, chloride ingress and microstructure of the fly ash cement paste was investigated by the electric conductivity measurement. The AC impedance method was applied to measure the electric conductivity of specimen, and backscattered electron image analysis and mercury intrusion method was applied for measuring pore structure in fly ash cement paste. As a result, the conductivity of fly ash cement paste was strongly depended on degree of reaction of fly ash. It was shown that a very high correlation was shown in chloride diffusion coefficient and electric conductivity regardless of a fly ash replacement ratio.

  • KURUMISAWA KIYOFUMI
    Constr Build Mater 101 (P1) 926 - 931 0950-0618 2015/12 [Refereed][Not invited]
  • Jamshidi Ali, Kurumisawa Kiyofumi, Nawa Toyoharu
    INFRASTRUCTURE ASSET MANAGEMENT 2 (4) 186  2053-0242 2015/12 [Refereed][Not invited]
  • Ali Jamshidi, Kiyofumi Kurumisawa, Toyoharu Nawa, Meor Othman Hamzah
    Journal of Cleaner Production 90 195 - 210 09596526 2015/01 [Refereed][Not invited]
     
    © 2014 Elsevier Ltd. In this study, the effects of various blast furnace slag (BFS) contents on the performance of cement pastes and pavement were investigated at two levels, the micro and the macro. At the micro level, the strength and chemical properties of cement pastes containing various percentages of BFS and subjected to different water curing periods were evaluated. At the macro level, the structural and sustainability performance of airport concrete pavements were studied. In this regard, several structural design charts were developed to determine the thickness of the concrete slab required to withstand traffic loadings for various versions of aircraft design and subgrade strengths. The sustainability of the concrete pavements was assessed in terms of fuel requirements and greenhouse gas (GHG) emissions. In addition, a simple graphical method was proposed for comparing structural and environmental performance of concrete pavements with respect to BFS content, subgrade strength, different versions of the aircraft design, fuel requirements and GHG emissions for pavement construction. Based on the results obtained using the proposed method and the structural and sustainability analyses, scenarios are suggested for choosing preliminary BFS content.
  • Kiyofumi Kurumisawa, Haruka Abe, Toyoharu Nawa
    CONCREEP 2015: Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures - Proceedings of the 10th International Conference on Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structure 1046 - 1052 2015/01 [Not refereed][Not invited]
     
    The durability of the concrete structure is determined by transport properties of concrete. The transport of chloride ions greatly changes by the amount of adsorption by hydrates. However, there are few studies on change of the amount of adsorption with the calcium leaching. In this study, the purpose is to investigate a change of the amount of adsorption of the chloride ion with the calcium leaching of hardened cement pastes. The amount of chloride ion adsorption increased with the increase of the replacement ratio of the blast furnace slag. We established an equation to predict the amount of chloride ion adsorption on C-S-H and Afm. It was clarified that the amount of chloride ion adsorption on C-S-H of leached hardened cement paste depends on Ca/Si and Al/Si.
  • KURUMISAWA Kiyofumi, NAWA Toyoharu
    Cement Science and Concrete Technology セメント・コンクリート論文集 69 (1) 207 - 213 0916-3182 2015 [Refereed][Not invited]
     
    Hardened cement paste with various inorganic electrolytes was prepared for investigating the effect of pore structure and pore solution on electric conductivity and transport properties. As a result, it was shown that the correlation between the total pore volume measured by mercury intrusion method and the apparent diffusivity of the chloride ion of hardened cement paste was low. On the other hand, it was shown that relationship between the diffusivity of the chloride ion and electric conductivity of the hardened cement paste by the AC impedance method was linear as reported Nernst-Einstein equation. From this result, it was shown that it is possible to estimate the diffusivity of hardened cement paste by the electric conductivity measurement even if pore structure and pore solution of hardened cement paste changed.
  • MIYAMOTO Masanori, KURUMISAWA Kiyofumi, NAWA Toyoharu
    Cement Science and Concrete Technology セメント・コンクリート論文集 69 (1) 183 - 190 0916-3182 2015 [Refereed][Not invited]
     
    It is important to evaluate the physical properties of the cement-based materials from pore structure for predicting the durability of cement based materials. Mercury Intrusion Porosimetry(MIP)is widely used for pore structure measurement method. However, it was reported that micro structure of hardened cement paste was destroyed by the drying treatment and applied high pressure. To solve them, low-temperature differential scanning calorimetry(LT-DSC)based on thermoporometry was proposed. However, studies about LT-DSC are few. Therefore, the effectiveness of LT-DSC measurement in pore structure measurement is not clear. In this study, we investigated whether pore structure measured by LT-DSC can evaluate physical properties of hardened cement paste. By comparing the results of LT-DSC and MIP, it was suggested that the measurement by MIP might cause the destruction in micro structure by drying and applied high pressure. It was cleared that it is possible to evaluate physical properties by total pore volume measured by LT-DSC. Moreover, it was indicated that threshold pore radius of the chloride ion diffusion was 7nm by using pore size distribution measured by LT-DSC.
  • KURUMISAWA KIYOFUMI, MURAKAMI YUTO, ISHIGAKI KUNIHIKO, NAWA TOYOHARU
    セメント・コンクリート論文集 67 (1) 137 - 143 0916-3182 2014/02 [Refereed][Not invited]
     
    Cement based materials such as the concrete are used as barriers of the radioactive waste disposal facilities. As for the cement based materials, the capacity for binding of the radionuclide is required in facilities, and the ability to control the leak of the nuclide to the external environment is also expected by the low diffusivity of cement based materials. The transport of radionuclide has to be controlled leakage to the external environment in the radioactive waste disposal facilities during 10,000 years. Therefore, the appropriate design of the radioactive disposal facilities is necessary, and the accurate mass transfer prediction model that considered the calcium leaching of cement based materials with the order for tens of thousands of years to evaluate it safely is necessary. In our current model, there is a difference between measurement and predicted value of chloride ion ingress as simulated a nuclide movement in the calcium leaching region of hardened cement paste. It is considered that the input parameter for the capacity for binding of the chloride ion of the hardened cement paste in calcium leaching region is not appropriate. The purpose of this study is to clarify the capacity for the binding of the hardened cement paste that calcium leaching occurred quantitatively.
    In the experiment, ammonium nitrate solution was used to accelerate calcium leaching of the hardened cement paste. The hardened cement paste with different composition by changing the immersion period was produced. The capacity for binding of the chloride ion by immersing the sample in NaCl solution was determined. In addition, the mineral composition of hardened cement paste was determined by the powder X-ray diffraction with Rietveld method, and the chemical bonding state of the silica chain of calcium silicate hydrate(C-S-H) was measured by a solid nuclear magnetic resonance device(NMR) to clarify the mechanism that quantity of chloride ion adsorption changed. The results in this study are followings. As immersion period became long, the CaO/SiO2 ratio of C-S-H in sample which immersed in ammonium nitrate solution decreased, and the capacity for chloride ion binding of leached sample also decreased. As for this reason, the decrease of the adsorption site by the polymerization of silica chains in C-S-H was suggested by the results obtained from NMR measurement, and monosulfate which was one of the hydrates in hardened cement paste was disappeared by calcium leaching. The capacity for chloride ion binding of hardened cement paste was formulated by the results of experiments, and it was able to estimate the predicted value with less than 25% of errors.
  • ABE Haruka, ISHIGAKI Kunihiko, KURUMISAWA Kiyofumi, NAWA Toyoharu
    Cement Science and Concrete Technology セメント・コンクリート論文集 68 (1) 226 - 232 0916-3182 2014 [Refereed][Not invited]
     
    It is very important to understand mastransport properties of aggressive substances the concrete to exactly predict the durability of the concrete. Transport properties of several ions concrete is influenced by its adsorption. It was clarified in previous reports that the adsorption ability is changed with the calcium leaching of concrete during service life. It was also reported that the adsorption ability of the C-S-H is depended on its Ca/Si. However, it is the report only for hardened white cement paste(WPC). In this study, blast furnace slag(BFS)was used for clarifying the effect of BFS on the adsorption ability of cement-based materials is investigated. As a result, the chloride adsorption ability of the specimen mixed with BFS had higher than that of only WPC even if calcium leaching occurs. It was shown that Ca/Si and Al/Si of C-S-H in specimen mixed with BFS changed with calcium leaching. And it was cleared that both of Ca/Si and Al/Si of C-S-H in specimen mixed with BFS had influence on the chloride adsorption ability. The chloride adsorption ability of C-S-H was shown to be correlated with the quantity of Q2Al in C-S-H from results of the 29Si-NMR. Finally, we established an prediction equation the chloride adsorption ability using Ca/Si and Al/Si of C-S-H.
  • KURUMISAWA Kiyofumi, NAWA Toyoharu
    Cement Science and Concrete Technology Cement Science and Concrete Technology 68 (1) 171 - 177 0916-3182 2014 [Refereed][Not invited]
     
    It is very important to evaluate the concrete durability for realizing sustainable society. The concrete durability is dependent on its transport properties. Therefore, it is necessary to measure the transport properties of concrete accurately. Nondestructive method is useful to measure transport properties of concrete. The resistivity measurement which is one of the nondestructive methods was proposed to measure the transport properties. It was reported that the resistivity and diffusion property is related. However, the resistivity(conductivity)is influenced by some factors such as aggregate content and water content of concrete. In this study, we investigated the conductivity of mortar for clarifying the effect of sand content or water to cement ratio(W/C)on the conductivity of mortar. As a result, mortar conductivity was dependent on its paste conductivity and the amount of sand. And it was possible to predict the conductivity of mortar by the proposed equation with water to cement ratio. It was shown that the effect of interfacial transition zone between sand and paste on conductivity is limited from the calculation of NIST model. It was clarified that there is good correlation between ultrasonic pulse velocity and electric conductivity of mortar. Finally, we suggested an equation to estimate the ultra-sonic pulse velocity of mortar from the conductivity.
  • K. Kurumisawa, H. Owada, M. Shibata
    Mechanics and Physics of Creep, Shrinkage, and Durability of Conrete: A Tribute to Zdenek P. Bazant - Proceedings of the 9th Int. Conf. on Creep, Shrinkage, and Durability Mechanics, CONCREEP 2013 285 - 292 2013/11 [Not refereed][Not invited]
     
    The porosity of hardened cement paste changes when it is exposed to the actual environments, and it may be expected that the chemical structure of the C-S-H undergoes changes. The C-S-H is the main component, comprising 60% or more by volume of hardened cement paste, and this study focuses on changes in the chemical structure of C-S-H. Deterioration induced by ammonium nitrate solution was accompanied by changes in the pore structure as well as structural changes in the C-S-H in the hardened cement paste. It was ascertained that when evaluating the decreases in the elastic modulus of the hardened cement paste, both the pore structure and the structure of the C-S-H must be considered. © 2013 American Society of Civil Engineers.
  • Kiyofumi Kurumisawa, Toyoharu Nawa, Hitoshi Owada, Masahito Shibata
    Cement and Concrete Research 52 190 - 195 00088846 2013/08 [Refereed][Not invited]
     
    In this report, X-ray photoelectron spectroscopy (XPS) and 29Si-MAS-NMR was used for the evaluation of deteriorated hardened cement pastes. The deterioration by ammonium nitrate solution was accompanied by changes in the pore structure as well as by structural changes in the C-S-H in the hardened cement paste. The CaO/SiO2 ratio of the C-S-H decreased with the progress of deterioration, there was also polymerization of the silicate in the C-S-H. It was confirmed that the degree of polymerization of silicate of the C-S-H in hardened cement paste can be determined by XPS. It was also shown that the polymerization depends on the structure of the C-S-H. © 2013 Elsevier Ltd.
  • 胡桃澤清文, 名和豊春
    コンクリート工学年次論文集(CD−ROM) 34 ROMBUNNO.1081  1347-4111 2012/06 [Refereed][Not invited]
  • AOYAMA TAKUTO, KURUMISAWA KIYOFUMI, NAWA TOYOHARU
    セメント・コンクリート論文集 セメント・コンクリート論文集 65 (65) 161-167 - 167 0916-3182 2012/02 [Refereed][Not invited]
     
    It is very important to predict the deterioration of concrete that is used for a storage container of the radioactive waste. So it is necessary to comprehend the deterioration of cement based materials associated with calcium leaching by contact with the ground water for the super long term. However, there are not many knowledge about the diffusion performance of deterioration of calcium silicate hydrate associated with calcium leaching. Therefore, this study focused on the degradation of calcium silicate hydrate with calcium leaching, in order to gain the knowledge of the transport properties of calcium silicate hydrate. As a result, there was the correlative relationship between porosity in calcium silicate hydrate and the diffusion coefficient of chloride ion of calcium silicate hydrate associated with calcium leaching. Also, we attempted to estimate the diffusion coefficient of chloride ion in the calcium leached hardened cement paste from plain hardened cement pastes, with the deterioration of calcium silicate hydrate and calcium hydroxide. And there was no difference between estimated value of the diffusion coefficient and measured one. Therefore, it was shown that it was important to consider the leaching of calcium hydroxide and the degradation of calcium silicate hydrate in order to predict of the transport properties of cement based materials.
  • NAWA Toyoharu
    セメントコンクリート セメントコンクリート (779) 38 - 43 03710718 2012/01 [Refereed][Not invited]
  • ISHIGAKI Kunihiko, KURUMISAWA Kiyofumi, NAWA Toyoharu
    Cement Science and Concrete Technology セメント・コンクリート論文集 66 (1) 111 - 118 0916-3182 2012 [Refereed][Not invited]
     
    Bleeding is defined as the upward movement of water after a concrete has been placed, but it has set. It affects on the physical properties of the cured concrete. However the effect of bleeding on the microstructure has not yet been understood quantitatively. In this study, the pore structure of hardened cement paste(HCP)which was deformed by bleeding was discussed quantitatively using electron microscopy method and thermoporometry by low temperature differential scanning calorimeter(DSC). Connectivity of pore structure was also examined by the LCR meter. It is clear that bleeding increases capillary pore in the upper part of cement paste than the lower part, and has few influence on the pore which is smaller than capillary pore. In addition, a correlation was seen between the porosity and electrical conductivity of HCP regardless of bleeding. That suggests that the connectivity of the pore structure of hardened cement paste is strongly dependent on its porosity.
  • AOYAMA Takuto, KURUMISAWA Kiyofumi, NAWA Toyoharu, MURAKAMI Yuto
    Cement Science and Concrete Technology Cement Science and Concrete Technology 66 (1) 311 - 318 0916-3182 2012 [Refereed][Not invited]
     
    It is very important to predict the deterioration of concrete that is used for a storage container of the radioactive waste. Thus it is necessary to comprehend the deterioration of cement based materials associated with calcium leaching by contact with the ground water for the super long term. We built the prediction model of diffusion in the hardened cement paste in consideration of the change in microstructure of the hardened cement paste with the Ca leaching, which is used a Nernst-Plank equation, an electro-neutral condition, and a diffusion of ions based on the Debye-Huckel equation. As a result, we can predict the transport of ions of the hardened cement paste with calcium leaching over time and the distribution of ions.
  • KURUMISAWA Kiyofumi, NAWA Toyoharu
    Cement Science and Concrete Technology Cement Science and Concrete Technology 66 (1) 127 - 134 0916-3182 2012 [Refereed][Not invited]
     Research paper (scientific journal) 
    It is necessary to improve transport properties of concrete for lengthening the durability of concrete, therefore it is very important to measure the pore structure of hardened cement paste precisely in understanding mass transport properties. Measurement in electric conductivity by the AC impedance method is suggested as simple and easy technique to understand it, and the usefulness is reported in the case of hardened cement paste used with ordinary Portland cement. However, this technique has not been applied for hardened cement paste mixed with blast furnace slag that has very high resistance to chloride ingress. In this study, chloride ingress and microstructure of the blast furnace slag cement paste(BFSC)was investigated by the electric conductivity measurement. For measuring the electric conductivity the AC impedance method was applied, and backscattered electron image analysis and mercury intrusion method was used for measuring pore structure in BFSC. The relationship between porosity and the electric conductivity was expressed by the Archie's law that is expressed with exponential function, and very high correlation was shown in chloride penetration depth and electric conductivity regardless of a blast furnace slag replacement ratio.
  • Kiyofumi Kurumisawa, Toyoharu Nawa, Hitoshi Owada
    Cement and Concrete Composites Cement and Concrete Composites 34 (3) 408 - 418 0958-9465 2012/03 [Refereed][Not invited]
     
    A three-dimensional image of hardened cement paste was reconstructed using a backscattered electron image (BEI) and used to predict the diffusion properties of hardened cement paste. After the BEI observations, an autocorrelation function (ACF) was calculated for each phase of the hardened cement paste, including the unhydrated cement, portlandite, and large pores. A three-dimensional image was reconstructed on the basis of the ACF based on random distributions. The dynamic elastic modulus and diffusion coefficient were calculated using a finite-element or finite difference method with the ...
  • IDE Takayuki, AOYAMA Takuto, KURUMISAWA Kiyofumi, NAWA Toyoharu
    Cement Science and Concrete Technology セメント・コンクリート論文集 65 (1) 464 - 469 0916-3182 2011 [Refereed][Not invited]
     
    Recently, ultra high strength concrete(UHSC)over compressive strength of 150N/mm2 was developed. Ultra high strength concrete property is determined by its composition such as cement type, fine aggregate, coarse aggregate. Especially coarse aggregate was critical for making UHSC, because stress concentration is occurred at contact zone of aggregate and cement matrix. In this study, we applied to nonlinear voxel finite element method with three dimensional image of concrete. As a result, static elastic modulus and compressive strength was able to predict by this method within 10% in error. Moreover, it was shown that the fracture strength of coarse aggregate, and the difference between the elastic modulus of mortar matrix and coarse aggregate is very important to achieve the ultra high strength of concrete.
  • 永井 学志, 池田 翔太, 胡桃澤 清文
    計算工学講演会論文集 = Proceedings of the Conference on Computational Engineering and Science 計算工学講演会論文集 = Proceedings of the Conference on Computational Engineering and Science 15 (2) 861 - 864 1342-145X 2010/05 [Not refereed][Not invited]
  • SUSTAINABLE DEVELOPMENT IN CONSTRUCTION
    Nawa Toyoharu, Kurumisawa Kiyofumi
    ADVANCES IN CONCRETE STRUCTURAL DURABILITY: PROCEEDINGS OF THE 2ND INTERNATIONAL CONFERENCE ON DURABILITY OF CONCRETE STRUCTURES ICDCS2010 211 - 217 2010 [Refereed][Not invited]
  • AOYAMA Takuto, KURUMISAWA Kiyofumi, NAWA Toyoharu, OWADA Hitoshi
    Cement Science and Concrete Technology セメント・コンクリート論文集 64 (1) 66 - 73 0916-3182 2010 [Refereed][Not invited]
     
    Transport characteristic of cement based materials is close to pore structure. To evaluate transport characteristic of cement based materials which have been used for super-long term, the microstructure of cement based materials will be metamorphosed by exterior environment, so it is necessary to consider the microstructure of cement based materials. However, many prediction models of transport characteristic focus only on pore structure, there are few prediction models of transport characteristic that consider the spatial distribution of C-S-H, portlandite, and pore. Therefore, this study focuses on the spatial distribution of each phase of cement based materials. From the 2-D backscattered electron image, the auto-correlation function of each phase of cement based materials is calculated, and the 3-D spatial image of cement based materials is estimated by using the auto-correlation functions. We attempt to estimate diffusion coefficient of chloride ion from the 3-D spatial image. Estimated value of the diffusion coefficient of chloride ion from the 3-D spatial image is as half as the experimental value. And we attempt to estimate diffusion coefficient of the deteriorated sample from 3-D spatial image of normal sample. There is a difference within 10 times between the estimated value from the 3-D spatial image of the normal sample and the experimental value of the deteriorated artificially sample.
  • FUKUSHIMA Koki, ISHIMORI Masatoshi, KURUMISAWA Kiyofumi, NAWA Toyoharu
    Cement Science and Concrete Technology Cement Science and Concrete Technology 64 (1) 74 - 81 0916-3182 2010 [Not refereed][Not invited]
     
    Dry and wet cycle experiment was carried out on hardened cement paste to understand the drying shrinkage mechanism and the effect of Shrinkage Reducing Agent(SRA)on the pore size distribution determined by Low Temperature Thermo Porosimetry(LT-DSC). In the specimen without SRA which was held at 20 degrees Celsius and relative humidity of 40%, the volume of Small Gel Pore(1.0 to 2.2 nm in radius)was reduced but it did not recover after dry and wet cycle experiment, while the volume of Large Gel Pore(2.2 to 6.0 nm in radius)did not change. Therefore, it could be clear that at this condition the main factor of the shrinkage and expansion was aggregation and dispersion of the C-S-H unit. On the other hand, in the specimen without SRA which was held at 40 degrees Celsius and relative humidity of 40%, the volume of C-S-H Gel Pore(1.0 to 6.0 nm in radius)was reduced but it did not recover after dry and wet cycle experiment, the pore structure became coarse and the volume of capillary pore increased. Thus, it could be clear that at this condition, the main factor of the shrinkage and expansion was aggregation and dispersion of the cluster of C-S-H. In contrast, in the specimen with SRA, the pore size distribution did not change after dry and wet cycle experiment. Therefore, it could be clear that SRA retain the C-S-H Gel Pore which contributes the shrinkage and expansion to reduce strain after dry and wet cycle experiment.
  • KAWAKAMI Hiroyuki, NAWA Toyoharu, KURUMISAWA Kiyofumi, MINATO Daisuke
    Cement Science and Concrete Technology セメント・コンクリート論文集 63 (1) 35 - 42 0916-3182 2009 [Refereed][Not invited]
     
    It has been recognized that the hydration behavior of Belite depends on the amount of Alite being coexistence with Belite, the curing temperature and the ionic concentration of leached calcium in pore solution. To understand these crucial factors on the hydration behavior of Belite, X-ray diffraction(XRD)and Rietveld analysis are carried out to quantify the hydration degree of Alite, Belite, and other cement hydrates. From the result obtained in this study, it is found that the amount of Alite has an influence on the hydration behavior of Belite;hydration degree of Belite decreases with increase in the amount of Alite. Furthermore, curing temperature(less than 50℃)does not have an affect the hydration behavior of α dicalcium silicate(α-C2S)but the hydration behavior of β dicalcium silicate(β-C2S)has temperature dependency. At high water to cement ratio of 10,000 percent, the ionic concentration of calcium in pore solution remains very low, and it brings about that the hydration degree of Alite stops at around 80% and the induction period is disappeared;however, there is no significant different on the hydration behavior of β-C2S from that at water to cement ratio of 50%. Therefore it might be concluded that the hydration behavior of β-C2S is not affected by the ionic concentration of calcium in pore solution.
  • KURUMISAWA Kiyofumi, NAWA Toyoharu
    J. Struct. Constr. Eng. J. Struct. Constr. Eng. 74 (642) 1405 - 1411 1340-4202 2009 [Refereed][Not invited]
     
    For achievement of long-term durability of concrete structures, it is important to get knowledge about properties of concrete. Nowadays, properties of concrete are determined by experimental or predicting from empirical equation. However, it is difficult to predict concrete properties at long-term, because it is impossible to do experiment. Therefore, it is necessary to make a model by considering its microstructure. Microstructure is a key for predicting the properties of concrete. Some properties are determined by microstructure such as C-S-H, calcium hydroxide, pores, unhydrated cement particles, interfacial transition zone and these interactions. In this study, we investigated dynamic elastic modulus of hardened cement pastes in view point from microstructure. Backscattered electron image was used for acquiring the microstructure image and autocorrelation function (ACF) of each phase was calculated by these images. The ACF was applied for reconstructing three dimensional structures from two dimensional images. Finally, three dimensional structures were used for calculating dynamic elastic modulus of specimen. It was cleared that the prediction result of dynamic elastic modulus used micro indentation result was good agreement with experimental result in high W/C.
  • Journal of structural and construction engineering. Transactions of AIJ Journal of structural and construction engineering. Transactions of AIJ 74 (642) 1405 - 1411 2009 [Refereed][Not invited]
  • KURUMISAWA Kiyofumi
    セメントコンクリート セメントコンクリート (741) 56 - 59 03710718 2008/11 [Not refereed][Not invited]
  • KURUMISAWA Kiyofumi, NAWA Toyoharu, NARA Yoshitaka
    Proceedings of the Japan Concrete Institute Proceedings of the Japan Concrete Institute 30 (1) 591 - 596 13477560 2008/07 [Not refereed][Not invited]
  • ELAKNESWARAN Yogarajah,NAWA Toyoharu,KURUMISAWA Kiyofumi,HAYASHI Ami
    セメント・コンクリート論文集 (61) 108 - 114 0916-3182 2008/02 [Not refereed][Not invited]
  • Proceedings of the Japan Concrete Institute Proceedings of the Japan Concrete Institute 30 (1) 591 - 596 13477560 2008 [Not refereed][Not invited]
  • ELAKNESWARAN Yogarajah,NAWA Toyoharu,KURUMISAWA Kiyofumi,FUSHIMI Koji
    セメント・コンクリート論文集 (60) 111 - 117 0916-3182 2007/02 [Not refereed][Not invited]
  • Proceedings of the Japan Concrete Institute Proceedings of the Japan Concrete Institute 29 (1) 63 - 68 13477560 2007 [Not refereed][Not invited]
  • Proceedings of the Japan Concrete Institute Proceedings of the Japan Concrete Institute 29 (1) 819 - 824 13477560 2007 [Not refereed][Not invited]
  • TERMKHAJORNKIT Pipat,NAWA Toyoharu,KURUMISAWA Kiyofumi
    Cem Concr Compos 28 (9) 781 - 789 0958-9465 2006/10 [Refereed][Not invited]
  • YAMASHIRO Yoichi, SAITO Toshiki, NAWA Toyoharu, KURUMISAWA Kiyofumi
    Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction 2006 (0) 271 - 272 13414437 2006/07 [Not refereed][Not invited]
  • NAWA T., KURUMISAWA K.
    コンクリート工学 = Concrete journal コンクリート工学 = Concrete journal 44 (5) 31 - 34 03871061 2006/05 [Not refereed][Not invited]
  • KURUMISAWA Kiyofumi,TANAKA Kyoji
    Cem Concr Res 36 (2) 330 - 336 0008-8846 2006/02 [Not refereed][Not invited]
  • Proceedings of the Japan Concrete Institute Proceedings of the Japan Concrete Institute 28 (1) 1871 - 1876 13477560 2006 [Not refereed][Not invited]
  • KURUMISAWA Kiyofumi, TERMKHAJORNKIT Pipat, NAWA Toyoharu
    Journal of structural and construction engineering. Transactions of AIJ Journal of structural and construction engineering. Transactions of AIJ 0 (603) 1 - 8 13404202 2006 [Not refereed][Not invited]
     
    Recently, the amount of the exhaust of fly ash increases by increasing thermal power plant. Using it as a concrete mixture material is an effective method for decreasing waste. However, the influence on the hydration of the cement and reaction rate of fly ash is not examined in detail. Then, the cement paste that mixed fly ash examined it by Backscattered Electron image and element image measured by Energy Dispersive X-ray analysis in this research. As a result, reaction rate of fly ash and distribution of fly ash and cement in the fly ash-cement pastes were clarified. And the amount of com...
  • KURUMISAWA Kiyofumi, TERMKHAJORNKIT Pipat, NAWA Toyoharu
    Journal of structural and construction engineering. Transactions of AIJ Journal of structural and construction engineering. Transactions of AIJ 0 (603) 9 - 16 13404202 2006 [Not refereed][Not invited]
     
    The elastic properties of concrete depend on the characteristic of cement matrix and coarse aggregates. The elastic characteristic of cement matrix depends on the cement paste when the properties of the fine aggregate are constant. That is, clarifying the characteristic of the cement matrix clarifies the elastic properties of concrete. Therefore, the technique for predicting the elastic modulus of the cement paste from the viewpoint of microstructure was examined in this research. It classified into four phases (pore, C-S-H, calcium hydroxide, and unhydrated cement) in the backscattered ele...
  • KURUMISAWA Kiyofumi, NAWA Toyoharu
    Journal of structural and construction engineering. Transactions of AIJ 日本建築学会構造系論文集 0 (595) 9 - 15 13404202 2005/09 [Refereed][Not invited]
     
    The durability of concrete is greatly influenced by the physical properties of the hardened cement paste. The physical properties of hardened cement paste are dependent on the degree of hydration and porosity of hardened cement paste. Therefore, it is important to measure the degree of hydration and porosity of hardened cement paste correctly. Measuring them, some methods are proposed, XRD, point counting or TG/DTA as example. Then, in this research, with Backscatter electron image (BEI) and Energy dispersive X-ray analysis (EDX), the degree of hydration and porosity of hardened cement past...
  • TERMKHAJORNKIT Pipat, NAWA Toyoharu, KURUMISAWA Kiyofumi
    Proceedings of the Japan Concrete Institute Proceedings of the Japan Concrete Institute 27 (1) 169 - 174 13477560 2005/06 [Not refereed][Not invited]
  • TERMKHAJORNKIT PIPAT, NAWA TOYOHARU, KURUMISAWA KIYOFUMI
    コンクリート工学年次論文集 27 (1) 169 - 174 1347-7560 2005/06 [Refereed][Not invited]
  • IMAGINGANALYSIS OF RELATIONSHIP BETWEEN PORE STRUCTURE AND PERMEABILITY OF Cl^- IN HARDENED CEMENT PASTE
    KURUMISAWA Kiyofumi, TANAKA Kyoji
    Journal of structural and construction engineering. Transactions of AIJ Journal of structural and construction engineering. Transactions of AIJ (584) 23 - 28 2004 [Refereed][Not invited]
     
    It is well known that most of property of concrete is influenced by its pore structure. ln particularly permeability of concrete is dependent on its pore structure. Therefore, it is beneficial to know durability of concrete that pore structure is measured exactly. We already developed the technique to make clear the pore structure in hardened cement paste by gallium intrusion and the following EPMA observation. In this research, using a image acauired by EPMA estimates diffusion coefficient with random walk which is many particles are walking in pore structure with random. The permeability ...
  • KURUMISAWA Kiyofumi, TANAKA Kyoji
    Journal of structural and construction engineering. Transactions of AIJ Journal of structural and construction engineering. Transactions of AIJ 0 (556) 9 - 14 13404202 2002/06 [Refereed][Not invited]
     
    It is widely known that the property of concrete is influenced by its pore structure, particularly permeability of concrete is directly dependent on it. We have already developed the technique to make clear the pore structure in hardened cement paste by applying gallium intrusion technique and the following EPMA observation. However, this method has only limited to 2 dimensional analysis. We improve the technique to 3 dimensional analysis of pores by stacking up 75 sheets of 2-D pore image pictures. In this paper, 3-D pore image is made up and pore distribution, shape and continuity of vari...
  • KURUMISAWA Kiyofumi, TANAKA Kyoji
    Journal of structural and construction engineering. Transactions of AIJ Journal of structural and construction engineering. Transactions of AIJ 0 (544) 1 - 6 13404202 2001/06 [Not refereed][Not invited]
     
    To understand the property of concrete, the knowledge about pore structure of hardened cement is important, particularly in early age of a few weeks, because the pore structure change by active hydration. In the paper, the change of pore structure in early age was investigated by observation of pores through gallium intrusion method developed by the authors and EPMA analysis. As the technique is limited to 2-dimensional analysis, the simulation of hydration developed by Bentz was furthermore carried outto obtain 3-dimensional information about pore structure. It was quantitatively made clea...
  • KURUMISAWA Kiyofumi, TANAKA Kyoji
    54 654 - 659 09163182 2001/02 [Not refereed][Not invited]
  • TANAKA Kyoji, KURUMISAWA Kiyofumi
    Journal of structural and construction engineering. Transactions of AIJ Journal of structural and construction engineering. Transactions of AIJ 0 (532) 21 - 26 13404202 2000/06 [Not refereed][Not invited]
     
    A mercury intrusion technique has been widely used to measure micro pores in porous materials. However, the information of shapes and locations of pores are not able to get through the measurement. A new technique for directly observing pores, in which gallium of liquid state is pressed into pores at higher temperature of its transformation temperature of 29.8℃ and then solidified by cooling down, was developed to measure them. The technique was applied to cement paste. The picture image of distribution of solidified gallium was observed through an electron probe micro analyzer (EPMA), and ...
  • KURUMISAWA Kiyofumi, TANAKA Kyoji
    Proceedings of the Japan Concrete Institute Proceedings of the Japan Concrete Institute 22 (2) 691 - 696 13477560 2000/06 [Not refereed][Not invited]
  • KURUMISAWA Kiyofumi, TANAKA Kyoji
    22 (2) 691 - 696 13404741 2000/06 [Not refereed][Not invited]
  • ABE Shinya, TANAKA Kyoji, KURUMISAWA Kiyofumi
    53 (53) 928 - 933 09163182 1999 [Not refereed][Not invited]

Conference Activities & Talks

MISC

  • NAGAI Gakuji, KURUMISAWA Kiyofumi  年次大会講演論文集 : JSME annual meeting  2010-  (8)  45  -46  2010/09   [Not refereed] [Not invited]
  • KURUMISAWA Kiyofumi, NAWA Toyoharu  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  (2010)  1273  -1274  2010/07   [Not refereed] [Not invited]
  • KURUMISAWA Kiyofumi, NAWA Toyoharu  Summaries of technical papers of annual meeting  (2015)  323  -324  2015/09   [Not refereed] [Not invited]
  • KURUMISAWA Kiyofumi, NAWA Toyoharu  Summaries of technical papers of annual meeting  (2014)  363  -364  2014/09   [Not refereed] [Not invited]
  • Elakneswaran Yogarajah, Nawa Toyoharu, Sato Tsutomu, Kurumisawa Kiyofumi, Iwasa Akihito  Proceedings of Annual / Fall Meetings of Atomic Energy Society of Japan  2010-  (0)  836  -836  2010   [Not refereed] [Not invited]  
    Cementitious materials are being used for encapsulation, back filling, and grouting purposes in deep geological repositories of long – lived radioactive waste. The long – term performance of cementitious materials has been investigating for safety disposal of radioactive waste. The durability performance of cementitious materials is mainly determined by resistance to transport of aggressive substances, however remain poorly understood. In this study, a thermodynamic integrated model has been developed to simulate multi-ionic transport in cementitious materials with considering ionic adsorption. The model has been validated against measured experimental data.
  • KURUMISAWA Kiyofuim, NAWA Toyoharu  Summaries of technical papers of annual meeting  (2012)  755  -756  2012/09   [Not refereed] [Not invited]
  • NAGAI Gakuji, KURUMISAWA Kiyofumi  The proceedings of the JSME annual meeting  2010-  (0)  45  -46  2010   [Not refereed] [Not invited]  
    To predict the macroscopic compressive strengths of hardened cement paste, a digital-image-based finite element procedure for damage evolution due to local tension is developed and its applicability from practical viewpoint is studied through numerical experiments. In the procedure, microscopic three-dimensional geometries of hardened cement paste are assumed to be periodic and each phase is randomly generated by using auto-correlation function evaluated from a two-dimensional SEM image of specimen. Nonlocal isotropic damage model is employed to represented crack evolutions in the geometries. Predicted macroscopic uni-axial compressive strengths are qualitatively consistent with experimental results in terms of water-cement ratio and material age.
  • JEON Jin-Hwan, MOMOSE Haruki, KANDA Tetsuji, KURUMISAWA Kiyofumi, NAWA Toyoharu  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  (2009)  783  -784  2009/07   [Not refereed] [Not invited]
  • Toyoharu Nawa, Kiyofumi Kurumisawa  Advances in Concrete Structural Durability - Proceedings of the 2nd International Conference on Durability of Concrete Structures, ICDCS 2010  211  -217  2010/01   [Not refereed] [Not invited]  
    Sustainable development is a major driver for future innovations and prospects for development of new construction materials with lower environmental impact. The use of industrial by-products in construction is very favourable to the sustainable development of our modern society. This article presents the situation of the sustainable recycling system of construction in Japan; In 2007 Japanese cement industry produced about 50 million tons of cement, and also used about 27 million tons of waste and by-products as alternative raw materials and fuel. Thus at present the construction industry can becomc the core of artificial ecosystem. Further eco-cement, which is made from municipal waste incineration ash and sewage sludge have been developed in Japan. ©2010 by Hokkaido University Press All rights reserved.
  • Numako Chiya, Kurumizawa Kiyofumi, Anraku Sotaro, Sakamoto Hiroyuki, Haga Kazuko, Shibata Masahito, Ohwada Hitoshi, Kurosawa Susumu, Yamada Norikazu, Nakazawa Toshiyuki, Sato Tsutomu  Abstracts of annual meeting of The Clay Science Society of Japan  52-  (0)  45  -45  2008   [Not refereed] [Not invited]  
    放射性廃棄物の地層処理に関して人工バリアとして設計されているベントナイトとセメントの相互作用を評価するために、放射光を用いたXAFS分析を適用した。XAFS測定は高エネルギー物理学研究機構物質構造科学研究所放射光実験施設Photon FactoryのBL9Aにおいて行った。試料としては合成CSHと種々の粘土鉱物、また人工バリア模擬体を3年程度浸水実験した試験片に対して行った。その結果、XAFS法が試料中のCaの化学形の決定及びベントナイトーセメント相互作用の評価に有用であることが解った。
  • K. Kurumisawa, T. Nawa, Y. Hirukawa  Creep, Shrinkage and Durability Mechanics of Concrete and Concrete Structures - Proceedings of the 8th Int. Conference on Creep, Shrinkage and Durability Mechanics of Concrete and Concrete Structures  1-  103  -108  2009/12   [Not refereed] [Not invited]  
    For improving the properties of concrete, fly ash and Blast furnace slag (BFS) is mixed with ordinary Portland cement (OPC). These blended concrete has a high resistance to chloride ingress by reducing large pores at later age. This is because fly ash and BFS is reacted with calcium hydroxide and then produce calcium silicate hydrate (C-S-H) gel which expand in cement matrix. It was well known that blended concrete has advantages such as low porosity and low calcium hydroxide content. However, the properties of C-S-H in blended concrete are not cleared well because its structure is changed with mineral admixtures. To understand the structure of C-S-H is important for predicting the properties of concrete. Recently, to determine the mechanical property of C-S-H, nano-indentation method is applied for hardened cement paste by Ulm et al. In their study, this method is only applied for OPC only or degraded OPC until now. Therefore, we applied this method for measuring the elastic modulus of blended hardened cement paste and also measured compositions of blended cement paste by backscattered electron image. As a result, the elastic modulus of HCP mixed with fly ash is lower than that of HCP only. It is indicated that the elastic behavior of C-S-H in blended cement is different from that in OC. © 2009 Taylor & Francis Group.
  • KURUMISAWA Kiyofumi, NAWA Toyoharu  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  (2006)  405  -406  2006/07   [Not refereed] [Not invited]
  • KURUMISAWA Kiyofumi, NAWA Toyoharu  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2005-  (2005)  425  -426  2005/07   [Not refereed] [Not invited]
  • Y. Elakneswaran, T. Nawa, K. Kurumisawa  RILEM Workshop on Long-Term Performance of Cementitious Barriers and Reinforced Concrete in Nuclear Power Plants, NUCPERF 2009  135  -142  2009/01   [Not refereed] [Not invited]  
    The mechanisms of the transport of species into the cementitious material have lately received a great deal of attention in durability problems. Hydrated cement acquires an electrical charge when it contacts with polar medium and leads to formation of Electric Double Layer (EDL). In this study, the significant influence of EDL properties on ionic transport through cement - based materials was investigated. Hardened cement paste shows net positive surface charge due to ionization of surface sites and adsorption ions from pore solution. EDL properties such as surface charge significantly influence not just on ionic adsorption but also on ionic diffusion. An integrated modelling approach employing phase - equilibrium model, surface complexation model, and multicomponent diffusion model was developed using PHREEQC to simulate the ionic ingress through cement - based materials. A comparison of predicted and experimental chloride profile is presented for hydrated cement paste. The surface charge influence is much higher on ionic transport in gel pore as compared in other pores. Chloride is being held in chemical combination as Friedel's salt and also bound mainly by adsorptive action of cement hydrates. Finally, an influence of pozzolanic materials on chloride binding (chemical as well as physical) and diffusion is discussed.
  • MATSUBARA Tomoko, TANAKA Kyoji, KURUMISAWA Kiyofumi  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2002-  (1)  253  -254  2002/08   [Not refereed] [Not invited]
  • KURUMISAWA Kiyofumi, TANAKA Kyoji  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2002-  (1)  761  -762  2002/08   [Not refereed] [Not invited]
  • KURUMISAWA Kiyofumi, TANAKA Kyoji  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2001-  (2001)  497  -498  2001/07   [Not refereed] [Not invited]
  • KURUMISAWA Kiyofumi, TANAKA Kyoji  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2000-  (2000)  789  -790  2000/07   [Not refereed] [Not invited]
  • KURUMISAWA Kiyofumi, TANAKA Kyoji  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  1999-  (1999)  703  -704  1999/07   [Not refereed] [Not invited]
  • MATSUMURA Kotaro, KURUMIZAWA Kiyofumi, KAWASE Kiyotaka  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  (1998)  389  -390  1998/07   [Not refereed] [Not invited]

Research Grants & Projects

  • Ministry of Education, Culture, Sports, Science and Technology:Grants-in-Aid for Scientific Research(若手研究(B))
    Date (from‐to) : 2011 -2012 
    Author : Kiyofumi KURUMISAWA
     
    北海道大学The purpose of this study is to predict the transport of ion in the hardened cement paste that calcium leaching occurred quantitatively. Furthermore, the mass transfer prediction model was improved by incorporating the phase equilibrium of solid-liquid interaction and3-dimensional spatial image model. As a result, it is possible to predict the transport of ion by the proposed prediction model. The AC impedance method that is simple and non-destructive measurement was applied to measure the transport properties of hardened cement paste, it is clarified that the relationship between the measured conductivity by AC impedance and diffusion coefficient of hardened cement paste was in good agreement.
  • Ministry of Education, Culture, Sports, Science and Technology:Grants-in-Aid for Scientific Research(若手研究(B))
    Date (from‐to) : 2009 -2010 
    Author : Kiyofumi KURUMISAWA
     
    北海道大学The section of the hardened cement paste was observed by a backscattered electron image to predict the properties of cementitious materials with mineral admixtures and quantified its microstructure by an autocorrelation function with the quantity of each phase. A three-dimensional image model was built by the supposition that each phase was distributed in the three-dimensional space in isotropic homogeneity based on them at random. Diffusion performance and mechanical properties of the hardened cement paste with this three-dimensional image model was calculated. As a result, about the diffusion performance, it was able to predict diffusivity of the hardened cement paste by using the value that it was based on a study in the past from the value that measured diffusivity of hydrates by micro-indentation method and estimated. In addition, the elastic modulus of hydrates was estimated from a stress-strain curve of the hardened cement paste reversely and it was shown that elastic modulus of hydrates is a function of the porosity and clarified that fracture criterion of hydrates was about 1,000μ regardless of curing age and the water cement ratio.
  • Modelling of porous media
    Date (from‐to) : 2008

Educational Activities

Teaching Experience

  • Advanced Information Processing for Resources Engineering
    開講年度 : 2017
    課程区分 : 修士課程
    開講学部 : 工学院
    キーワード : 化学反応 無機材料 モデリング 多孔体材料 数値解析 微分方程式
  • Sustainable engineering materials
    開講年度 : 2017
    課程区分 : 修士課程
    開講学部 : 工学院
  • Advanced Information Processing for Resources Engineering
    開講年度 : 2017
    課程区分 : 修士課程
    開講学部 : 工学院
    キーワード : 化学反応 無機材料 モデリング 多孔体材料 数値解析 微分方程式
  • Advanced Information Processing for Resources Engineering
    開講年度 : 2017
    課程区分 : 修士課程
    開講学部 : 工学院
    キーワード : 化学反応 無機材料 モデリング 多孔体材料 数値解析 微分方程式
  • Sustainable engineering materials
    開講年度 : 2017
    課程区分 : 博士後期課程
    開講学部 : 工学院
  • Advanced Information Processing for Resources Engineering
    開講年度 : 2017
    課程区分 : 博士後期課程
    開講学部 : 工学院
    キーワード : 化学反応 無機材料 モデリング 多孔体材料 数値解析 微分方程式
  • Applied Mathematics I
    開講年度 : 2017
    課程区分 : 学士課程
    開講学部 : 工学部
    キーワード : 常微分方程式 ラプラス変換 フーリエ解析 偏微分方程式
  • Numerical Computation
    開講年度 : 2017
    課程区分 : 学士課程
    開講学部 : 工学部
    キーワード : 2進数,誤差,反復法,ニュートン法,非線形方程式,連立方程式、ガウスの消去法,LU分解,反復法,ヤコビ法,ラグランジュ補間,台形公式,オイラー法,ルンゲ・クッタ法, 微分方程式,偏微分方程式
  • Exercise in Thermodynamics
    開講年度 : 2017
    課程区分 : 学士課程
    開講学部 : 工学部
    キーワード : ガスサイクル、蒸気の性質、気液二相サイクル、熱移動
  • Thermodynamics
    開講年度 : 2017
    課程区分 : 学士課程
    開講学部 : 工学部
    キーワード : 熱、仕事、第一法則、第二法則、エントロピー、理想気体、熱機関、相平衡、化学平衡
  • Experiments for Sustainable Resources Engineering Ⅰ
    開講年度 : 2017
    課程区分 : 学士課程
    開講学部 : 工学部
    キーワード : 基本操作、物理計測、化学分析


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